EditorGui.cs Missing Script or Dir -- textureScripts?

While I was sorting out my scripts, got through most of it with no problem, had take out the Hardcoded Load of "Default" Texture in NewMissions.mis and things like that... I ran across this little line in EditorGui.cs

$TerraformerTextureDir = "common/editor/textureScripts";

Now one little glitch I ran into, (I've completely removed all RW and FPS files, created my own textures, and rearranged my Directory structure... I'm gonna drop scripting, don't want the game hacked after all)...

I had to reload the basic terrain textures in the editor. Not sure if it was due to this "textureScripts" file/dir not existing or not. I've gotten around most issues so far, (I've havent modified the source code yet...), but was curious if this was a missing file/dir?
I've got both the CD and CVS versions, I checked em both (searched), but work with the 'HEAD' version only.

Any ideas what this refers to and why it doesn't exist??